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On exhaust [ to open or to close - Cars & Trucks

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Whats the worst that could happen if I've adjusted valves incorrectly?


If the valves are too tight, they don't fully close. That can "burn" the valves, causing an expensive repair job to replace the valves. Too loose will make tapping noises and eventually can wear the cam.

Nov 14, 2015 | Cars & Trucks

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Mitsubishi Fuso Truck engine model 6M70 Intermittent opening and closing of exhaust valve.


this is an exhaust brake truck where the brake is in the exhaust manifold
the brake valve is actuated through a solenoid that controls the air pressure to the valve cylinder or the electric solenoid for the valve
it is operated either by the driver through a switch on the steering column or by a switch at the accelerator pedal where when the exhaust brake is switched on then with the accelerator pedal in the idle position it activates the actuator
there the problem will be in the switch at the base of the accelerator pedal, the switch in the dash or in the actuator itself

Sep 04, 2015 | Mitsubishi Cars & Trucks

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Intermittent opening and closing of Exhaust Valve


have the exhaust brake tappets adjusted
you haven't mentioned engine size or type so I am talking about jacob brake or dynatard brake
it is possible that when the engine oil viscosity is heavy that the clearance is nit enough
take it in to a service center for as better diagnosis

Sep 04, 2015 | Cars & Trucks

2 Answers

After top dead center what valve starts opening number 1 intake or number 1 exhaust?


It depends on which TDC you are talking about, compression TDC or exhaust TDC. On the compression stroke, no valves will open after TDC-this is when combustion has occured, the power stroke. When the piston reaches bottom and starts up on the exhaust stroke, then exhaust valve will open. At TDC of exhaust stroke, exhaust valve will be closed, and the intake valve will then open as piston is moving down.
If you have the intake valve opening right after TDC, you are on the exhaust stroke of that cylinder. The exhaust valve is only open during upward movement of the piston on the exhaust stroke. Immediately after TDC of exhaust stroke, the intake will open as the piston travels downward.

Mar 04, 2014 | Mitsubishi Cars & Trucks

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I would like to know the position of the cam lobes when tdc on a Suzuki dr 500


There are two TDC's, TDC of the compression stroke, both cam lobes will be up, away from the valves. On TDC of the exhaust stroke, the exhaust lobe will be just past the exhaust valve, and the intake lobe will just be ready to open the intake valve. See, as the piston rises on the exhaust stroke, the exhaust valve is open. When piston reaches TDC, the exhaust will close, and the intake will be opening as the piston begins downward again. Coming up on the compression stroke, and on up to TDC, both valves remain closed-lobes are away from valves.

Nov 28, 2013 | Cars & Trucks

2 Answers

Does valves have to be closed when engine is at tdc on 2002 mitsubishi eclipse 2.4


The valves for any given cylinder will be closed when that particular cylinder is at TDC and on the "firing" cycle. Since 4 cycle engines have four "cycles" the piston can be at TDC twice. Once for firing and once when the exhaust cycle is completed and the intake cycle is starting.

Cycle 1: Intake valve is open and piston is travelling DOWN. (Intake)
Cycle 2: Both valves are closed and the piston is travelling UP (compression)
Cycle 3: Fuel has been ignited and the piston is travelling DOWN ( power)
Cycle 4: Exhaust valve is open and the piston is travelling UP (exhaust)

TDC is Top Dead Center, or the point that the piston is at the top of it's travel.

Jun 11, 2011 | Mitsubishi Eclipse Cars & Trucks

2 Answers

Making sure i'm on the compression stroke


Hi,
The compression stroke is when the piston is traveling UP and the intake and exhaust valves are both closed.

Intake: Piston going down, intake valve open, exhaust valve closed
Compression: Piston going up, intake and exhaust valves closed
Power: Piston going down, intake and exhaust valves closed
Exhaust: Piston going up., intake valve closed, exhaust valve open

Mar 16, 2011 | Toyota Tacoma Cars & Trucks

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What will happen if the exhaust valve is open during the compression stroke?


That would make it an exhaust stroke. Are you saying that your cam is 180 degrees out of time?
I don't know why the valve is open, but the valve should start to close before the piston gets to the top. If the valve is still completely open when the piston gets to the top of its stroke, I would expect it to bend the exhaust valve.

Feb 09, 2011 | BMW X5 M Cars & Trucks

1 Answer

How do you tell if you are on exhaust or intake stroke on a 1.6 geo prism engine


The intake valve will be opening or open on the intake stroke and the same for the exhaust. If you are looking for TDC for timing purposes both valves will be closed and as you keep turning the crank the exhaust valve will start to open. Just back it up a little until it closes and your timing marks on the crank line up. Hope this helps.

Jul 02, 2010 | 1991 Geo Prizm

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